Ultrasonographic measurement of cross-sectional area of the median and ulnar nerves in healthy Japanese children

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Ultrasonography is a painless and rapid method, which is attractive for testing in children. The objective of this study was to try to measure a cross-sectional area (CSA) at predetermined sites along the median and ulnar nerves in children by ultrasonography. The CSAs measured by ultrasonography were determined bilaterally at the mid-humerus of median nerve (MedArm) and the arterial split of ulnar nerve (UlnProx) in 20 healthy Japanese children from 1 to 6 years old. Participants were 10 boys and 10 girls, 4.0 ± 1.8 years of age. The maximum value of CSA at the MedArm was 5mm2 up to 3 years old and 7mm2 from 4 to 6 years old. The maximum value of CSA at the UlnProx was 3mm2 up to 3 years old and 4mm2 from 4 to 6 years old. We identified the possibility of the ultrasonographic measurement of nerve sizes in children who were younger than those of the previous studies for children.

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